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  1. bertus

    Op Amp Substitute?

    Hello, The replacement of the opamp with an 4558 would not be a problem. You can also run the circuit on 9 Volts, as the CD4093 will work upto 12 Volts. Bertus
  2. bertus

    NOS KDS XF-9I CRT, geometry issues

    Hello, Perhaps the following page might also give some hints: http://www.repairfaq.org/sam/monfaq.htm Bertus
  3. bertus

    Electrolytic capacitor doubts

    Hello, Did you not get enough info here: Doubts about electrolytic capacitors Bertus
  4. bertus

    Stacking Transformers for Ultra High Voltage

    Hello, I am not aware that high voltage alone can produce X-rays. I do know that high voltage can create arcs that will produce ozone. Bertus
  5. bertus

    Stacking Transformers for Ultra High Voltage

    Hello, What is your intention with the very high voltage? Always have a good safety guideline to follow: http://www.repairfaq.org/sam/safety.htm Bertus
  6. bertus

    Back to the Breadboard

    Hello, It is not usual to use a 3 letter abbreviation for the colors in electronics. Most time there are 2 letters as on the following page: https://www.hitechcontrols.com/cables/technical-information/48-color-abbreviations.html The following page gives 2 and 3 letter combinations...
  7. bertus

    how to make a low harm taser using 9v battery

    Hello, Did you read the Terms and Rules ? Discussions of weapons is not allowed. Bertus
  8. bertus

    Which speakers are best for home?

    Hello, Perhaps the following forum might fit better for your question: https://www.diyaudio.com/ Bertus
  9. bertus

    Requesting Ideas for my Next Venture

    Hello, Here are a couple of examples for a metronome: https://www.nutsvolts.com/blog/post/build_an_electronic_metronome https://www.thatraymond.com/2019/04/22/555-metronome Bertus
  10. bertus

    Can’t find a 0.35 ohm 5% resistor anywhere

    Hello, @73's de Edd , Yes, you are right, the transistor shows severe damage. @ZedsDeadd , Can you take a picture from the front of the transistor? It will need to be replaced. Bertus
  11. bertus

    Power drop

    Hello, From the pictures, I can not tell wich connections are inputs and outputs on the speed controller board. I would connect the speed controller board between the power source and reverse switch controller. Bertus
  12. bertus

    Power drop

    Hello, Bertus
  13. bertus

    And now something weird

    Mum in hysterics after set of £245 car mats she bought for her hubby’s birthday arrived smaller than palm of her HAND https://www.thesun.co.uk/fabulous/15304942/mum-hysterics-245-car-mats-smaller-palm-hand/
  14. bertus

    Can’t find a 0.35 ohm 5% resistor anywhere

    Hello, A 2 Watt resistor would be about 9 X 3.5 mm. Bertus
  15. bertus

    Can’t find a 0.35 ohm 5% resistor anywhere

    Hello, What is the size of the resistor? That could determine the power of the resistor. https://au.mouser.com/Passive-Components/Resistors/_/N-5g9n?P=1z0vidtZ1z0x6frZ1z0z819 You might also want to have a look WHY the resitor burned. There can be an other part faulty that will have caused the...
  16. bertus

    Power drop

    Hello, Have a look at the following bi-directional DC motor speed controller from quasar. Bertus
  17. bertus

    Comedy Thread

    Thanks nsaspook AAC
  18. bertus

    Can’t find a 0.35 ohm 5% resistor anywhere

    Hello, According to the table I posted, it could be a 0.36 ohms resistor. That should be more easy to find. Bertus
  19. bertus

    Comedy Thread

    Thanks cmartinez AAC
  20. bertus

    Power drop

    Hello, It looks like you did not connect the speed regulator boards correctly. Do you have details on both boards? It looks like the speed regulator board has in and outputs. The speed regulator board may not like being reversed. Bertus
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